Through bolts, also known as expansion bolts, are a type of fastener used for heavy-duty applications where a strong and secure fixing is required. They are commonly used for fixing heavy items to concrete, brick, and other solid materials. Through bolts work by expanding when tightened, creating a strong and secure grip on the material they are fixed to. They consist of a bolt, a nut, and a sleeve or anchor, which is placed into a pre-drilled hole in the material. To install a through bolt, a hole is drilled through the material and the anchor is inserted. The bolt is then inserted through the fixture and threaded into the anchor. As the bolt is tightened, the anchor expands and creates a tight grip on the material. Through bolts are available in a range of sizes and materials to suit different applications. Stainless steel through bolts are suitable for outdoor use as they are resistant to corrosion, while galvanized steel through bolts are suitable for indoor use. It is important to choose the correct size and type of through bolt for the specific application to ensure a secure and safe installation. It is recommended to consult a professional if unsure about the correct type and size of through bolt to use.